Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74bea2af85f10c0…

MALICIOUS

PDF

50.6 KB Created: 2020-08-30 21:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36eb3b2328854b3d3c8b46d478fa077 SHA-1: c9f50efa240071e607a53f4cba28570216c1298f SHA-256: a74bea2af85f10c00e86ccf00adf758fe9b8b8353d627d7c0cb6c1974e13ac15
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=joanna+martine+woolfolk+birth+chart+calculator'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=joanna+martine+woolfolk+birth+chart+calculator
    • https://static.usrfiles.com/ugd/1cc7e8_0454d0927f5f47ac8f1e966c42ab98d5.pdf
    • https://static.usrfiles.com/ugd/cac9e4_02cb135aed44447186fe86e2561732ec.pdf
    • https://static.usrfiles.com/ugd/b56239_72da91b53b894121a5c8feb9abd4a31c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b62c544c6b27459db7f4b7e1f6e53453.pdf
    • https://static.usrfiles.com/ugd/b8c837_351a181d98fa4a3eb7301eebd9f2f107.pdf
    • https://cdn.shopify.com/s/files/1/0462/7680/4768/files/sprained_groin_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/hutech_hinode_solar_guider.pdf
    • https://static.usrfiles.com/ugd/599f1c_c8b65e030a7b4517bdb197b6e860fb5f.pdf
    • https://static.usrfiles.com/ugd/a86d68_4380ed240aac4081bead1cfa37eb1749.pdf
    • https://static.usrfiles.com/ugd/b8c837_7471b1917eb94287b999ede0c3e7c742.pdf
    • https://static.usrfiles.com/ugd/8acad3_8f14e9e0cdef44b7ba5d262647893fe3.pdf
    • https://static.usrfiles.com/ugd/99965f_1ead2e92d0c04f109eb81a816009a9c6.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/7669771098.pdf
    • https://cdn.shopify.com/s/files/1/0438/2900/2390/files/39607802353.pdf
    • https://cdn.shopify.com/s/files/1/0456/8544/0671/files/string_theory_school_of_performing_arts.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087f9.bin
447a8f611f05f8864bd29d809568702439dce64a95ba3b55234d42d04dc3df39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F9 5228 bytes
font_01_sfnt_off000099af.bin
5f37af13d6756a31c5ede2465da46446d2210f0221417b271585552349a0e11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AF 10356 bytes

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